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https://issues.apache.org/jira/browse/CALCITE-3164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16878138#comment-16878138
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Muhammad Gelbana commented on CALCITE-3164:
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You're correct. It turned out that my type-system is causing this. I overrode
{{deriveSumType}} and {{deriveAvgAggType}} to return non nullable {{BIGINT}}
and {{DOUBLE}} types respectively.
After fixing those overrides tp return nullable types instead, the query
started returning {{NULL}} as expected.
> Averaging an all-nulls values after grouping produce NaN instead of NULL
> ------------------------------------------------------------------------
>
> Key: CALCITE-3164
> URL: https://issues.apache.org/jira/browse/CALCITE-3164
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.20.0
> Reporter: Muhammad Gelbana
> Priority: Major
>
> {code:sql}
> -- Values are a single tuple
> SELECT C1, avg(C2)
> FROM (VALUES('X', NULL::INT)) T (C1, C2)
> GROUP BY C1
> -- Values are more than a single tuple
> SELECT C1, avg(C2)
> FROM (VALUES('X', NULL::INT), ('X', NULL::INT)) T (C1, C2)
> GROUP BY C1
> {code}
> Those queries return {{NaN}} while it's expected to return {{NULL}}.
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